Within hours, Internet trolls and pranksters began churning out hoaxes, misinformation and lame jokes aimed at misleading the public, promoting their own platforms and laughing in the wake of tragedy.

Many of them worked, garnering hundreds of reposts on social media from possibly duped users. It all highlighted a gullibility and lack of judgement too common online: Social media users are far too trusting of random accounts that filter into their feeds.

Take this tweet from user @bloomoreos claiming his father is missing in Vegas. It went viral with 600-plus retweets, but is a photo of adult film star Johnny Sins. The account later appeared to be suspended.

More fake info about the shooting at Mandalay Bay Casino in Las Vegas.

Here's a user claiming his brother was in the Mandalay Bay hotel, and "doesn't ask his cell phone." According to Buzzfeed News, the man in the photo is actually linked to the case of a teen murdered in Mexico.